IEM Daily Bulletin for Jul 17 2024

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 17 July 2024

News

No news is good news

IEM Code Pushes <to branch> on Github

• Jul 16 9:22 AM <main> mnt: sundry updates per log review
• Jul 16 9:32 AM <main> Merge pull request #838 from akrherz/240714-2
  Omnibus

Daily Feature

July 15 Possible Derecho
Date: 16 Jul 05:23 AM
Votes: Good: 18   Bad: 0 Abstain: 0

The severe weather threat on Monday materialized as forecast with a cluster of strong storms developing mid afternoon over central Iowa and then congealed into a damaging line of storms that plowed east. At the time of this feature writing, this system has yet to be a labelled a derecho, but it seems likely that it met the criteria of duration and areal coverage. The featured map presents NWS Local Storm Reports of thunderstorm wind gust and damage. As with many storms this year, this system appeared to produce a number of brief tornadoes as well making the event even more dangerous. NWS offices will be out surveying the damage today and the IEM has a Google Group you can subscribe to for email alerts when they issue damage survey reports.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 16 Jul 2024 - 12 AM 17 Jul 2024 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	16	0	0	0	0	0	0	0
Svr Tstorm	252	0	0	0	0	0	0	8
Flash Flood	35	0	0	0	0	0	0	---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued: 266 Verified: 146 [54.9%]
Polygon Size Versus County Size            [25.9%]
Average Perimeter Ratio                    [25.8%]
Percentage of Warned Area Verified (15km)  [28.9%]
Average Storm Based Warning Size           [1925 sq km]
Probability of Detection(higher is better) [0.80]
False Alarm Ratio (lower is better)        [0.45]
Critical Success Index (higher is better)  [0.48]